I've been using Gitea, previously using Gogs, for a team of 45 and have had a very pleasant experience. Getting it up and running with docker* was smooth and it works easily with Certbot.
Definitely a great option for a GitHub alternative where you aren't looking for a feature-packed, i.e. large, deployment like Gitlab. It's simple and clearly delineated in its functionality.
However, it does suffer from a lack of good documentation - but I could just look at Gogs' documentation if needed since they're practically identical.